Tester



FIG. 1 is a prospective view of an embodiment of a tester according to my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines having repeated short dashes in the Figures are for illustrative purposes only and form no part of the claimed design. Shade lines having a combination of long and short lines in the Figures show contour and not surface ornamentation. 

CLAIM The ornamental design for a tester, as shown and described. 